Can Mockito handle methods that return generics in Scala?

Question

I want to mock the return from javax.servlet.http.HttpServletRequest, getParameterNames(). Therefore:

import org.specs.Specification
import org.specs.mock.Mockito
import scala.collection.JavaConversions._
import javax.servlet.http.HttpServletRequest

object SomethingSpec extends Specification with Mockito {
    "Something" should {
        "do something" in {
            val request = mock[HttpServletRequest]

            // This is fine
            val elements: java.util.Enumeration[String] = List("p1", "p2").iterator

            // But this bombs
            request.getParameterNames() return elements
        }
    }
}

Compilation of the last line results in this difficult-to-understand error:

found   : java.util.Enumeration[String]
required: java.util.Enumeration[?0] where type ?0

Am I doing something wrong?

Steve · Accepted Answer · 2011-05-27 09:29:46Z

1

have you tried to cast the return value from the HttpServletRequest like

request.getParameterNames().asInstanceOf[java.util.Enumeration[String]] returns elements

It seems, getParameterNames returns an untyped Enumeration.

answered May 27, 2011 at 9:29

Steve

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1 Comment

gladed Over a year ago

Seems like a Mockito bug, since getParameterNames definitely returns an Enumeration[String]. But this helps me work around the problem. Thanks!

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